Find the amount of silver liberated at cathode if 0.500A of current is passed through AgNO3 electrolyte for 1 hour. Atomic weight of silver a 107.9 g/mole.
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Thermal and Chemical Effect of Current question types
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Thermal and Chemical Effect of Current questions
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Find the thermo-emf developed in a copper-silver thermocouple when the junctions are kept at 0°C and 40°C. Use the data in table.
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Find the neutral temperature and inversion temperature of a copper-iron thermocouple if the reference junction is kept at 0°C. Use the data in the table.
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A brass plate having surface area 200cm2 on one side is electroplated with 0·10mm thick silver layers on both sides using a 15A current. Find the time taken to do the job. The specific gravity of silver is 10.5 and its atomic weight is 107.9 g/mol.
Is neutral temperature always the arithmetic mean of inversion temperature and the temperature of the cold junction? Does the unit of temperature have an effect in deciding this question?
The specification on a heater coil is 250V, 500W. Calculate the resistance of the coil. What will be the resistance of a coil of 1000W to operate at the same voltage?
Is inversion temperature always double of the neutral temperature? Does the unit of temperature have an effect in deciding this question?
A plate of area 10cm2 is to be electroplated with copper (density 9000kg/m3) to a thickness of 10 micrometres on both sides, using a cell of 12V. Calculate the energy spent by the cell in the process of deposition. If this energy is used to heat 100g of water, calculate the rise in the temperature of the water. ECE of copper = 3 × 10-7kg C-1 and specific heat capacity of water = 4200Jkg-1.
A coil of resistance $100\Omega$ is connected across a battery of emf 6.0V. Assume that the heat developed in the coil is used to raise its temperature. If the heat capacity of the coil is 4.0J/K, how long will it take to raise the temperature of the coil by 15°C?
View full solution →Do all the thermocouples have a neutral temperature?
Consider the situation shown in figure. The width of each plate is b. The capacitor plates are rigidly clamped in the laboratory and connected to a battery of emf $\in.$ All surfaces are frictionless. Calculate the value of M for which the dielectric slab will stay in equilibrium.
View full solution →Find the charge required to flow through an electrolyte to liberate one atom of.
- A monovalent material.
- A divalent material.
A servo voltage stabiliser restricts the voltage output to 220V ± 1%. If an electric bulb rated at 220V, 100W is connected to it, what will be the minimum and maximum power consumed by it?
A bulb with rating 250V, 100W is connected to a power supply of 220V situated 10m away using a copper wire of area of cross-section 5mm2. How much power will be consumed by the connecting wires? Resistivity of copper $1.7\times10^{-8}\Omega-\text{m}$.
View full solution →The 2.0Ω resistor shown in the figure is dipped into a calorimeter containing water. The heat capacity of the calorimeter together with water is 2000JK-1.
- If the circuit is active for 15 minutes, what would be the rise in the temperature of the water?
- Suppose the 6.0Ω resistor gets burnt. What would be the rise in the temperature of the water in the next 15 minutes?
An electric kettle used to prepare tea, takes 2 minutes to boil 4 cups of water (1 cup contains 200cc of water) if the room temperature is 25C.
- If the cost of power consumption is Rs. 1.00 per unit (1 unit - 1000 watt-hour), calculate the cost of boiling 4 cups of water.
- What will be the corresponding cost if the room temperature drops to 5°C?
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